Electrical coil



F b, 10, 1 925. v N. E. LZNDENBLAD ELECTRICAL COIL- Filed Dec. 27, 1921S Sheets-$h9at 1 gn uawtoz N1 L5 E. LINDENBLAD $3M; M5 Gum/M4 9 2 W Feb.10. 5925.

" N. E. LINDENELAD ELECTRICAL COIL Filed Dec. 1921 if Sheets-Shem v v E,IJNDENBLAD 2% his fi m W MW F sh; 10, 1925.

N.E.UNDENBLAD ELECTRICAL COIL Sheets-Sheet 5 Filed D90. 27, 1921gvmemtoz NaLs E. UNDENBLAD his flbtoz/me' 0 8g); 3 my Patented Feb. ill,i925.

uni'rr. STATES PATENT Fries.

NILE E. LZNDENBLflD, O3? BRUOKLYN. NEW YGR-K, ASSIGHQR TO RADEOGbRPOB-ATION ATEEERICA, CQRPEBRA IZON OF DELAWARE.

ELECTRICAL QQIL.

Application filedfiecember 27. Serial 1V0. 5525,2350.

To all 2071 am it may cancer-n:

Be it known that l, NILS'E. Linux-Binnie, a citizen of Sweden, and aresident of the boroughof Brooklyn, Kings County, 1; York, have inventedcertain new and use- -tul Improvements in Electrical Coils, of which thefollowing is a'specification accon'r panied by drawings.

This invention relates to high frequency inductance coils and similarapparatus. In wireles telegraphy inductance coils are used for loadingthe antenna and tuning or balancingyarious circuits connected therewith.These coils are not wound in compact relation, like low frequency coils,but are made up of a plurality of spaced turns of wire such asLitzendra/ht or other suitable wire or cable. It has been customary towind the cable on porcelain rods spaced apart in such a way that a drumshape coil is produced. There are several disadvantages of such a typeof inductance, chief among which are the dificulty of repairing the coilit a porcelain rod becomes broken and the liability of breaking down theinsulation of the porcelain rod by the high potential, which neccssarily is applied directly to the supporting rods. Furthermore, thenumber of turns in a coil of this kind cannot be readily increased itoccasion demands as the porcelain rods are usually made no longer thannecessary to support the number of turns of wire as first arranged.

It is the object of my invention to overcome these and otherdiiliculties in high frequency inductance coils and the manner in whclithis is accomplished will be explained in the following-specification,reference being had to the drawings in which: i

Fig. 1 is an elevation of one of the train of insulators supporting" thecoil.

Fig. 2 is a perspective View of the inductance coil.

Fig. 3 is a perspective clone of the insulators and sdgacent parts. Fig.l is an enlarged side view of a portion of the train of insulators shownin Fig. 1. Fig. 5 is a cross section on the line 5-5 of Fig. l.

Referring to Fig. 1 of the drawing, the cable supports are made up of aplurality of porcelain or similar insulators 1' in the form of across asshown more clearl in Fig. 3. Metallic plates 2 insulated 031 each otherby the porcelain suppe secured between adjacent insula means of ll bolts3 and located at angles to each other and extending in op sitedirections which pass through dingo holes in theporcelain as shown inFigs. l and The'plates are clamped in position between the insulators bymeans of nuts on the ends of bolts so taat a substantially rigid trainof insu is produced and these may be ad to maize any desired length. Anynumbero .-=.y be arranged above each other the drawing I have shown onlytwo. two of trains are secured at one end to rel which in turn isconnected to a supporting post 6. The other end of the series isconnected to a similar rod 7. -lo hold the st of insulators in spacedrelation 1' n'nty pose spacing insulators 8 and 9, shown. Vl henevcrthese insulator connections are added the plates, such as 11, may bebent at right angles so that the U bolts of adjacent horizontalinsulators 1 may be clamped to one end and the U bolts of the insulators8 may be clamped to the other end. insulators 8, and the U bolts u dtherewith, may be of the same form as t shown in 3.

In Fig. 2 the insulator trains A A, B B etc. are made up of individualinsulators and plates as shown in Fig. 1. The preferred manner ofwinding the cables on the in sulators is as follows: I

Starting at 12 the cable is clai'nped against the first plate 2 as shownmore clearly in Figs. 1 and. i. it is then clamped to the 90 firstplates in B, C, l)", E and F in succession. If an insulating covering isaround the cable it is preferably removed at the point Where it isclamped to the plates 2 so as t place the plate at the same potential asthe cable at that point. After one turn is completed the cable thenpasses to the first lower plate of A. The cable is then clamped insuccession to the first plates of each of the other lower insulators B.C, etc. until the plate in train F is reached. The cable then passes tothe second plate in the upper insulator A and thence to all of thesecond plates in the other upper series. After the second turn is madethe cable ex- 106 tends to the second series in the train 1%.:

B, etc, and anot I turn, is made 1 MES v Q Int '5 way the turnsarealternately made at; the top and-bottom and-extend inwardlystepby-"step'until the last turn 16 is made.

"""lo this last turn is connected the second terminal 17 kit will beunderstood that all the cables are clamped to the plates located-fbetween "the "insulators andlpreferably good metallic 'contactexistsbetween the cables and-plates. By connectingth'e terminal 17 tothe high potential end of the antenna, or .other art of the system withwhich it is therefore may be looped under the turns of the coil andconnected to the antenna or other part of the system withouthigh-potential insulatorsas no strain is placed on this terminalother'thaii its own weight.

It will befseenfrom the construction chosen that the insulators arebroken u .into. a. plurality of short insulators with aconductin'gplates'between; Therefore, the

potential is distributed at spacedpoints throughout theinsulator train.This means that each insulator is required to stand only the potentialof two turns of the coil and liability ofthe insulator breaking down isreduced to-a minimum. If the insulator consisted'of a unitary insulatorrod. with the cables clampedin s aced relation to it it would bel moredifficult to obtain an equal sential.

voltage distribution. For this reason the prior construction consistingof vertical porcelain rods has a limit of length beyond which it isimpractical to go. With my construction the coil may be made of as manyturns or layers as desired. j The insulators 1 can be continuallyaddedto the trains with interspersed plates teeny lengtln desired and nobreakdown points will be reached becausev n the embodiment shown eachinsulator has to stand the voltage of two turns only.

The shapes of theinsulators 2' are not material as any form may be'used.I pro for however the star shaped insulator shown in Fig. 3 as it isastandard form of insulator of moderate price. The articular arrangementof coil shown in ig. 2 is hexagonal in shape but this of course is not-es-. This was given by way of example only and any con u'ation may beused.

gt Also additional trains and insulators may be added so as to supportmore than two layersin the coil, that is, each post 5, 7

may have three or more trains. clamped thereto. i

If desired, the opposite metal rods 7 may endinsulatom. a

be-secumtogether. b cables such as indicated at 18, particular y whilethe cables are being strung but these may be left in place afterwards,aethe-rods are insulated by the Having, described my inventiontwhat 1claim is: I

1. In an electrical coil, .a series of separate insulators hayingconducting members therehetween. and means for; fastening said 7 coil tosaid conducti v members.

2. In electrical co a series of separate 7 insulators'smured togetherwith 00Ddl10% H members therebetween and having tum the coil fastened tosaid'memhers.

3. In electrical coils, a. plurality of acedturns, a plurality ofseparate insu ators having conducting members disposed therebetween andeach of said members supporting a turn or" said coil. 35

d. in an electrical coil, a plurality of conducting turns and aplurality of separate insulators having conducting members disposedtherebetween and connected to different turns of said coil.

5. In an electrical coil, a plurality of conducting turns, and aplurality of spaced trains composed-of separate insulators each havingconducting members disposed between said insulators and connected todifferent turns ofsaicl coil for supporting the turns at a plurality ofpoints in the circumference. I

6.111 on electrical coil, :1. pluralit of sep-' arate conductin turns insubstantially the same lane,,a plurality of sup orts located at di erentpoints in the rip cry of said coil, said supports comprising a luralityof insulators with conducting mem rs disposed therebetween and connectedto the turns of said coil.

' 7; In an electrical inductance, a plurality of fiat coils, a supportfor each of said coils,

each of said supports comprising a plurality of trams of separateinsulators at difierent points in the periphery of said coils, the

insulators of said trams having conducting members disposed thercbetwecnand 'connected to the turns of the coils.

8. In an electrical coil, aninsulator be tween the turns of said coilhaving a. conducting member attached to each of its op posite sides 9.In an electrical coil, an insulator be-' tween the turns of the coil,said insulator having-two holes through the center, conducting memliersatopposite sides of the insulator and a pair of U shaped bolts pass:ixigshrough'eai holes and fastened to said p a a a 10. In an electricaljcoil, an insulator between the turns of the coil, saidinsulator havingtwo holes at right angles to each other through the center, conductinplates at opposite sides of the insulator an a pair of ogglositelyextendi U bolts fossil throng plates. 7

11. In iui elecirical coil, a trainof insuiators each having holes andadepte to support and insul'at the turns of a coll conducting platesbetween said insulators and U bolts extenaiing throughsaid holes in saidinsulatols'and fastened to the plwtes said holes an fastened em forconnecfiing said :lnsuletors and plates 'intoatrain.

12. In an electrical coil, 0 'irain oI insumg holes and adapted tosupport and msulete the turns of a coil, conducting plates between saidinsulatols, extening through oppositely inclined diagcnal holes in saidinsulators and fitting in the grooves formed by the extending portions03. said insulators for connecting the plaes and insulators to form asmechanically connected train.

NILS E. LINDENBLAD.

lators of star-shaped cross section each havand a pair of U bolts

